188 Intinois NaturAL History SurvEY BULLETIN 
1927, Frison & Glasgow, 1 6 ; Rock River, 
June 26, 1947, B. D. Burks, 1 ; July 24- 
25, 1947, Burks & Sanderson, 1 6. Quincy: 
June 7, 1939, Burks & Riegel, 16. Rock- 
rorp: May 22, 1941, Ross & Burks, 1 6,12 ; 
May 15, 1942, Ross & Burks, 1¢. Rock 
Istanp: 124, 42 (Walsh 1862:374). 
Rockton: Rock River, June 25, 1947, B. 
D. Burks, 1¢. SHAWNEETOWN: July 14, 
1948, Mills & Ross, 1¢. STERLING: at 
light, May 21, 1925, D. H. Thompson, 1 4 ; 
May 22, 1941, Ross & Burks, 1¢. 
7. Heptagenia cruentata Walsh 
Heptagenia cruentata Walsh (1863:205). 
The types of this species are lost, but 
there are a male and female in the collection 
at the Museum of Comparative Zoology 
which were determined as of this species by 
Walsh. They were collected a year after 
the description was published. 
Mate.—Length of body 7-8 mm., of fore 
wing 9-11 mm. Head usually entirely shaded 
with red; compound eyes pearl-gray, the 
two eyes separated on meson by a space 
slightly narrower than a lateral ocellus. 
Thorax with notum light red-brown, pleura 
and sternum deep yellow. Legs yellow, 
femora and tibiae extensively stained with 
red, this red shading more intense in middle 
and at apex of each femur and on basal 
half of each tibia; tarsi grayed toward 
apexes; first fore tarsal segment one-fourth 
as long as second; wings hyaline, with mem- 
brane in costal and subcostal interspaces 
washed with yellow; all longitudinal veins 
and crossveins in hind wing golden, cross- 
veins dark brown in fore wing, those in 
costal and subcostal interspaces broadened 
and darker. Abdomen deep yellow, with a 
broad, longitudinal, median, red-brown 
stripe on dorsum, this interrupted on each 
of tergites 2-8 by a longitudinal, median, 
yellow line and a pair of lunate, submedian, 
light streaks; genitalia, fig. 369, with for- 
ceps yellow and penis lobes red-tan; caudal 
filaments light yellow, with articulations 
light red-brown. 
FEMALE.—Length of body 8 mm., of fore 
wing 10 mm. General color as in male, but 
yellow of body lighter, and red- and brown- 
shaded areas less conspicuous; legs colored 
as in male except that red shading is ob- 
scure on tibiae; dorsum of abdomen only 
lightly shaded with red-tan; posterior mar- 
Vol. 26, Art. 1 
gin of terminal abdominal sternite only 
slightly incised on meson; caudal filaments 
light yellow, articulations sometimes faintly 
darkened. 
NympuH.—Unknown. 
The species is known from Illinois, Mani- 
toba, and Nebraska. 
Illinois Records.—AnwNa:: at light, July 
22, 1938, Burks & Boesel, 1¢. D1xon: 
June 27, 1935, DeLong & Ross, 1¢. 
PROPHETSTOWN: Rock River, July 2425, 
1947, Burks & Sanderson, 56, 12; June 
26, 1947, B. D. Burks, 1¢. Quincy: June 
8, 1939, Burks & Riegel, 114, 139; July 
13, 1937, Mohr & Burks, 16, 39. Rock 
IsLanD: 42, 32 (Walsh 1863:205) ; June 
7, 1937, Burks & Riegel, 1¢. Rockton: 
Rock River, June 25, 1947, B. D. Burks, 44. 
LUCIDIPENNIS Group 
8. Heptagenia rusticalis McDunnough 
Heptagenia rusticalis McDunnough 
(1931b:92). 
Mate.—Length of body and of fore wing 
5-6 mm. Head yellow on face, shading to 
brown on vertex; compound eyes contiguous 
on meson. Dorsum of thorax brown, blend- 
ing into deep yellow on pleura and sternum; 
legs dull, deep yellow, femora suffused with 
brown; wings hyaline, veins and crossveins 
colorless. Abdominal tergites dull brown, 
venter deep yellow, anterior tergites each 
with a faint, longitudinal, median, yellow 
line and a pair of submesal, longitudinal, — 
yellow streaks; genitalia, fig. 370, smoky 
yellow; caudal filaments gray. 
FEMALE.—Length of body 5-6 mm., of 
fore wing 6-7 mm. In appearance, similar 
to male, but head entirely light red-brown; — 
entire thorax dull yellow; abdominal ter- — 
gites lightly washed with red-brown, ster- 
nites yellow; posterior margin of terminal — 
abdominal sternite evenly rounded from side 
to side; caudal filaments pale yellow. 
NympH.—Unknown. 
The species is known from New York, 
Ohio, and Quebec. 
9. Heptagenia inconspicua McDunnough 
Heptagenia inconspicua McDunnough 
(1924b:118). . 
Ma e.—Length of body 4-5 mm., of fore 
wing 5-6 mm. Head tan; compound eyes — 
light gray, contiguous on meson. Thoracic 
